Ampelomyces quisqualis (antagonist)

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brown pycnidium of Ampelomyces quisqualis releasing spores (click on image to enlarge it)
Author(s): Paul Bachi, University of Kentucky Research and Education Center
Source: IPM Images
cucurbit powdery mildew (white mycelium) on pumpkin leaf being parasitized by Ampelomyces quisqualis which has produced the brown spore-producing pycnidia (click on image to enlarge it)
Author(s): Paul Bachi, University of Kentucky Research and Education Center
Source: IPM Images

Ampelomyces quisqualis (antagonist) Ces. : Schlidt.

The fungus is an antagonist (mycoparasite) to powdery mildews from the order of Erysiphales. It lives inside the hyphae and conidiophores of the host fungus producing pycnidia. A. quisqualis is commercially available and used on crops like grapevine and cucumber.